Question

trade blocs help countries by
limiting competition.
increasing barriers to trade.
improving product production.
allowing the pooling of resources.

Explanation:

Trade blocs are groups of countries that come together to promote trade among themselves. Limiting competition is not a positive aspect. Increasing barriers to trade goes against the purpose of trade blocs. Improving product production is not the main way they help. Pooling resources (such as sharing infrastructure, knowledge, etc.) is a key benefit of trade blocs.

Answer:

allowing the pooling of resources.